package com.song.server.config.security;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

// 权限控制 - 判断用户角色

@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {


    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> collection) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : collection) {
            // 当前url所需要的角色
            String needRole = configAttribute.getAttribute();

            // 如果当前url是登录即可访问的话
            if ("ROLE_LOGIN".equals(needRole)) {
                // 判断当前用户是否登录（当前用户是匿名用户身份令牌）
                if (authentication instanceof AnonymousAuthenticationToken) {
                    // 当前用户没有登录
                    throw new AccessDeniedException("尚未登录，请先登录！");
                } else {
                    return;
                }
            }

            // 判断用户角色是否是当前url所需要的角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(needRole)) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("权限不足，请联系管理员！");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return false;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return false;
    }
}
